JP2012220163A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that gives excellent audibility by reducing harsh NZ noise generated by the interference of blow-off air from a turbo fan with a baffle plate which partitions an opening of a heat exchanger and fixes the heat exchanger.SOLUTION: In the air conditioner configured so that a heat exchanger 18 which is bent rectangularly, and has its corner opened is arranged to surround the periphery of a turbo fan provided in a unit body 10, and a baffle plate 25 which partitions an inner space 23 sectioned by the heat exchanger 18 and an outer piping chamber 24 is provided in the opening of the corner, a plurality of holes 25A are bored only in the upper half part of the baffle plate 25 corresponding to the main plate side of the turbo fan.

Description

  The present invention relates to an air conditioner of a type in which a heat exchanger bent into a rectangular shape is disposed so as to surround a turbo fan.

  For example, in a ceiling-embedded air conditioner that is installed embedded in the ceiling of a room, a turbo fan is installed on the top plate of the unit body, and a heat exchanger that is bent and formed in a substantially rectangular shape is disposed around it. It is set as the structure. One corner portion of the heat exchanger bent into a rectangular shape has an opening, and the opening of the corner portion has a function of partitioning an inner space and an outer piping chamber partitioned by the heat exchanger, A baffle plate having a function for fixing the exchanger to the main body is provided.

  This baffle plate is generally a flat plate. However, if a simple flat plate is installed, most of the air flow blown out from the turbofan is circulated downstream through the heat exchanger, but in the part where the baffle plate is provided, Since the air flow is not circulated downstream, the baffle plate and the blowing air from the turbo fan interfere with each other, and a large pressure fluctuation occurs in this portion. Along with this, a frequency (f = NZ / 60 (Hz)) is determined by the number of fan blades (Z) and the number of rotations (N), so-called NZ sound is generated, which becomes an annoying protruding sound. It was not preferable for hearing.

  Therefore, Patent Document 1 discloses a predetermined opening in which the lower part is smaller than the upper part in the height direction in a heat exchanger connecting plate (baffle plate) that connects both ends of the heat exchanger and partitions the opening. By providing a large number of openings (holes), the main flow on the main plate blown out from the turbofan flows into the pipe storage space on the back side from the upper side opening (hole) where the opening ratio is increased After that, a U-turn is made from there to a lower side opening (hole) with a small opening ratio, where it is decelerated and flows out again into the blowout flow path of the turbofan.

Japanese Patent No. 4005016

  However, the thing of the said patent document 1 eliminates the phenomenon that the reflow outflow from the piping storage space side of a heat exchanger connecting plate (baffle plate) to the turbo fan blowing air passage is accelerated toward the turbo fan, By suppressing the interference with the blowout air from the turbofan, the ventilation resistance of the blowout air from the turbofan is reduced, the pressure fluctuation is reduced, the noise is reduced, and the heat exchanger cannot pass. In addition, the flow toward the one side of the heat exchanger, which is accelerated when passing through the surface of the heat exchanger connecting plate, suppresses the humule sound around 2000 to 4500 Hz, which is generated by peeling off at the fin tip, and the audibility is improved. It is something that is improved.

  For this reason, when the air flow blown out from the turbofan passes through the baffle plate installation section, a large pressure fluctuation is generated by directly interfering with the baffle plate, and accordingly, there is a gap between the baffle plate and the turbofan. The NZ sound generated due to the passage of the fan blades cannot be effectively suppressed, and the annoying NZ sound of “boon” near a specific frequency cannot be sufficiently reduced.

  The present invention has been made in view of such circumstances, and is generated when the blown air from the turbofan interferes with the baffle plate that partitions the opening of the heat exchanger and fixes the heat exchanger. An object of the present invention is to provide an air conditioner that reduces harsh NZ sounds and has a good audibility.

In order to solve the above-described problems, the air conditioner of the present invention employs the following means.
That is, the air conditioner according to the present invention is provided with a heat exchanger that is bent into a rectangular shape so as to surround the turbo fan provided in the unit body, and one corner portion of which is opened. The air conditioner is provided with a baffle plate that partitions an inner space partitioned by the heat exchanger and an outer piping chamber at an opening of the corner portion, wherein the baffle plate includes a turbofan A plurality of holes are formed only in the upper half portion corresponding to the main plate side.

  According to the present invention, the baffle plate for partitioning the inner space and the outer piping chamber partitioned by the heat exchanger is provided at the opening of one corner portion of the heat exchanger that is bent into a rectangular shape. Since the baffle plate has a plurality of holes in only the upper half corresponding to the main plate side of the turbo fan, the main flow of the air flow blown from the main plate side of the turbo fan When passing, it flows out to the outer piping chamber side through a plurality of holes provided only in the upper half corresponding to the main plate side of the baffle plate, and the baffle from the turbo fan is blown by the buffer effect of this outer piping chamber. Large pressure fluctuations due to interference with the plate can be mitigated. Therefore, the so-called NZ sound generated when the fan blades pass between the baffle plate and the turbofan can be reduced, and the audibility of the air conditioner can be improved.

  Furthermore, the air conditioner of the present invention is characterized in that, in the air conditioner described above, the plurality of holes formed in the baffle plate are slit holes that are elongated in the horizontal direction.

  According to the present invention, since the plurality of holes drilled in the baffle plate are elongated slit holes in the horizontal direction, the baffle plate is configured so that the air flow blown from the turbo fan follows the air flow. Through the horizontal elongated slit hole provided in the air, the air flows smoothly to the outer piping chamber without increasing the airflow resistance, and due to its buffer effect, the blown air from the turbofan passes through the baffle plate part. Pressure fluctuation can be reduced. Therefore, pressure fluctuation between the baffle plate and the turbo fan can be more effectively mitigated, and NZ noise can be reduced.

  Furthermore, the air conditioner of the present invention is the air conditioner according to any one of the above-described air conditioners, wherein the plurality of holes formed in the baffle plate are downstream of the upper half portion of the baffle plate in the turbo fan rotation direction. It is characterized by being provided only in the region.

  According to the present invention, since the plurality of holes formed in the baffle plate are provided only in the region on the downstream side in the turbo fan rotation direction of the upper half of the baffle plate, the air flow blown out from the turbo fan The main flow of air flows out to the outer piping chamber side, and the buffer effect reduces the fluctuation in the pressure of the blowing air, while the air blown from the turbofan flows out from the entire surface of the baffle plate to the outer piping chamber. The influence on the equipment pipe temperature detection function and the like can be suppressed. Accordingly, it is possible to reduce the NZ noise while improving the hearing of the air conditioner while eliminating the influence on the heat exchanger fixing function due to the function deterioration and rigidity reduction due to the holes provided in the baffle plate.

  Furthermore, the air conditioner of the present invention is characterized in that, in any of the above air conditioners, the baffle plate is bent into a convex shape on the outer piping chamber side.

  According to the present invention, since the baffle plate is bent into the convex shape on the outer piping chamber side, the distance between the baffle plate and the turbo fan is bent into the convex shape toward the outer piping chamber side. As a result, the distance can be made as large as possible, and the distances can be kept substantially uniform. Therefore, the pressure fluctuation between the baffle plate and the turbofan can be further reduced by the damping effect by increasing the distance and maintaining the distance substantially equal, and further reduce the NZ noise. .

  Furthermore, the air conditioner according to the present invention is provided with a heat exchanger that is bent into a rectangular shape so as to surround a turbo fan provided in the unit body, and one corner portion of which is opened. The air conditioner is provided with a baffle plate that partitions between an inner space partitioned by the heat exchanger and an outer piping chamber at an opening of the corner portion, wherein the baffle plate is the outer piping. It is characterized by being bent into a convex shape on the chamber side.

  According to the present invention, the baffle plate for partitioning the inner space and the outer piping chamber partitioned by the heat exchanger is provided at the opening of one corner portion of the heat exchanger that is bent into a rectangular shape. This baffle plate is bent into a convex shape on the outer piping chamber side, so the distance between the baffle plate and the turbo fan is bent into the convex shape toward the outer piping chamber side. Therefore, the distance can be made as large as possible and the distances can be kept substantially uniform. Therefore, the air conditioner is reduced by reducing the pressure fluctuation between the baffle plate and the turbo fan by the damping effect by increasing the distance and keeping the distance substantially uniform, thereby reducing the so-called NZ noise. Can be improved.

  According to the air conditioner of the present invention, when the main flow of the air flow blown from the main plate side of the turbofan passes through the baffle plate portion, a plurality of portions provided only on the upper half portion corresponding to the main plate side of the baffle plate. Outflow through the hole to the outer piping chamber side, and the buffer effect of the outer piping chamber can mitigate large pressure fluctuations caused by the blowout air from the turbofan interfering with the baffle plate. It is possible to reduce the so-called NZ sound that is generated when the fan blades pass between the two and improve the audibility of the air conditioner.

  According to the air conditioner of the present invention, the distance between the baffle plate and the turbo fan is made as large as possible by bending the baffle plate into a convex shape toward the outer piping chamber side, and the distances are substantially equal. Therefore, the above-mentioned distance is increased and the pressure fluctuation between the baffle plate and the turbofan is reduced by the damping effect by maintaining the distances substantially evenly, and so-called NZ noise is reduced. Therefore, the audibility of the air conditioner can be improved.

1 is a schematic configuration diagram of an air conditioner according to an embodiment of the present invention. It is the top view of the state which removed the ceiling panel and looked at the indoor unit shown in FIG. 1 from the downward direction. FIG. 3 is a perspective view of the indoor unit shown in FIG. 2 as viewed from below with the turbo fan removed. It is a longitudinal cross-sectional view of the state which cut | disconnected the indoor unit shown in FIG. 2 to the up-down direction. It is a longitudinal cross-sectional view of the state which cut | disconnected the indoor unit shown in FIG. 3 in the left-right direction. It is a figure which shows the reduction effect of the NZ sound by this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a schematic configuration diagram of an air conditioner according to an embodiment of the present invention.
As shown in FIG. 1, the air conditioner 1 includes an indoor unit 2 installed on a ceiling surface of the room (hereinafter, the indoor unit 2 may be referred to as an air conditioner) and an outdoor unit. The outdoor unit 3 is installed in a proper place and connected to the indoor unit 2 via two refrigerant pipes 4 of a liquid pipe and a gas pipe and a communication line 5, and is connected to the indoor unit 2. The wired remote controller 6 is used for driving operation.

Here, the air conditioner 1 in which one indoor unit 2 is connected to one outdoor unit 3 will be described, but a multi-type air conditioner in which a plurality of indoor units 2 are connected in parallel is also described. Needless to say, the same applies.
The outdoor unit 3 includes devices such as a refrigerant compressor (not shown), a four-way switching valve, an outdoor electronic expansion valve, an outdoor heat exchanger, a receiver, an outdoor fan including a fan motor, and an outdoor controller. The outdoor unit 3 constitutes a refrigeration cycle together with an indoor heat exchanger 18 and an indoor electronic expansion valve 19 which will be described later provided in the indoor unit 2, and bears a function of adjusting the refrigerant supplied to the indoor unit 2.

  As shown in FIG. 1, the indoor unit 2 includes a unit main body 10 installed on the ceiling surface of the room and the like, and a ceiling panel 11 attached to the lower part thereof. The ceiling panel 11 is provided with a suction grill 12 for sucking room air at the center, and air outlets 14 provided with a wind direction adjusting louver 13 for blowing conditioned air around the center are arranged in four directions. . 2 to 5, a fan motor 15, a turbo fan 16 driven by the fan motor, a bell mouth 17 provided on the suction side of the turbo fan 16, a turbo, An indoor heat exchanger (heat exchanger) 18 disposed so as to surround the fan 16, an indoor expansion valve 19, a drain pan 20 provided at the lower portion of the indoor heat exchanger 18, a drain pump 21, an indoor controller 22 and the like are incorporated. ing.

  The fan motor 15 is fixedly installed at the center of the lower surface of the top plate 10A of the unit body 10, and a turbo fan 16 composed of a main plate 16A, a plurality of blades 16B and a shroud 16C is mounted on the rotating shaft 15A in the vertical direction. It is rotatably installed around the rotation shaft 15A. The bell mouth 17 disposed on the suction side of the turbo fan 16 turbocharges indoor air sucked through the suction grill 12 of the ceiling panel 11 through an air filter (not shown) provided on the ceiling panel 11 side. It is for guiding to the fan 16, and is provided with a circular opening 17A in the center.

  The indoor heat exchanger 18 is a plate fin & tube type heat exchanger, is bent into a substantially rectangular shape, and is fixedly disposed in the unit body 10 so as to surround the turbo fan 16. Further, the indoor heat exchanger 18 has an opening 18A in which one corner is opened by both ends of the heat exchanger. The opening 18A has an inner side defined by the indoor heat exchanger 18. A baffle plate 25 is provided for partitioning the space 23 and the piping chamber 24 formed outside thereof, connecting both ends of the indoor heat exchanger 18, and fixedly installing on the unit body 10 side.

  An outer space 26 surrounding the indoor heat exchanger 18 is provided on the ceiling panel 11 with temperature-controlled air blown from the turbo fan 16 and cooled or heated by passing through the indoor heat exchanger 18. It is an air guide path for introducing air to the four-direction air outlets 14. The piping chamber 24 is provided with refrigerant piping 4 such as a liquid pipe and a gas pipe connected to the indoor heat exchanger 18, and an indoor expansion valve 19 provided on the liquid pipe side. .

  The baffle plate 25 is connected between both end portions of the indoor heat exchanger 18, and as shown in FIG. 2 and FIG. 3, the baffle plate 25 is bent into a dogleg shape so as to be convex toward the piping chamber 24 side. The distance from the outer periphery of the turbofan 16 is as large as possible, and the distance is maintained substantially even. Further, as shown in FIGS. 3 to 5, the baffle plate 25 is elongated in the horizontal direction only in the upper half portion to which the main flow of the air flow blown from the main plate 16A side of the turbo fan 16 is blown. A number of slit holes (holes) 25A are formed.

  In the above embodiment, a large number of slit holes 25A are formed in a plurality of rows in the vertical direction on substantially the entire upper half of the baffle plate 25. The slit holes 25A are formed in the upper half of the baffle plate 25. The turbo fan 16 is provided only in the downstream region in the rotation direction N (see FIG. 2) to ensure the strength of the baffle plate 25 and installed in the refrigerant pipe 4 connected to the indoor heat exchanger 18 in the pipe chamber 24. The air flow blown from the turbo fan 16 may not be directly blown against the temperature sensor or the like.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The air conditioner 1 of this embodiment is operated by operating the wired remote controller 6, the operation mode selection button is used to select an operation mode such as cooling, dehumidification, or heating, and the temperature setting button and the air volume setting button are used to set the room temperature set value and the air volume. By arbitrarily setting etc., operations such as cooling, dehumidification or heating are performed. As a result, the refrigerant adjusted to a predetermined state from the outdoor unit 3 is supplied to the indoor heat exchanger 18 of the indoor unit 2, and heat is exchanged between the refrigerant and the indoor air circulated through the turbo fan 16. Thus, the room air is cooled or heated and air-conditioned so that the room has a set temperature.

  At this time, most of the air flow blown out from the turbo fan 16 passes between the fins of the indoor heat exchanger 18 installed so as to surround the turbo fan 16, and the outer space (air guide path) 26 thereof. Since the air flow is not circulated to the downstream side in the portion where the baffle plate 25 connecting both ends of the indoor heat exchanger 18 is provided, the baffle plate 25 is more circulated to the air outlet 14. And air blown from the turbo fan 16 interfere with each other.

  However, in the present embodiment, a number of slit holes 25A that are elongated in the horizontal direction are formed in the upper half portion of the baffle plate 25 corresponding to the main flow of the air flow blown from the main plate side of the turbofan. Therefore, the air flow blown out from the turbo fan 16 flows out to the outer piping chamber 24 side through the many slit holes 25A, and the air blowing from the turbo fan 16 is caused by the buffer effect of the piping chamber 24. Large pressure fluctuations due to interference with the baffle plate 25 can be mitigated.

  As a result, the so-called NZ sound generated when the fan blade 16B passes between the baffle plate 25 and the turbo fan 16 can be reduced, and the audibility of the indoor unit 2 can be improved. FIG. 6 shows the effect of reducing this NZ sound, and it has been confirmed that by adopting the above configuration, the annoying NZ sound of “boon” near 125 Hz can be reduced by about 10 dB (A). Yes.

  Further, since the hole 25A formed in the baffle plate 25 is a slit hole 25A that is elongated in the horizontal direction along the horizontal air flow blown from the turbo fan 16 as described above, it interferes with the baffle plate 25. The air flow to be flowed smoothly to the outer piping chamber 24 side without increasing the ventilation resistance, and due to the buffer effect, the air blown from the turbo fan 16 passes through the installation portion of the baffle plate 25. Pressure fluctuation can be reduced. Therefore, pressure fluctuation between the baffle plate 25 and the turbo fan 16 can be more effectively mitigated, and NZ noise can be reduced.

  A large number of slit holes 25A drilled in the baffle plate 25 may be provided only in the region downstream of the turbo fan rotation direction N in the upper half of the baffle plate 25 as described above. The main flow of the air flow blown out from the fan 16 flows out to the outer piping chamber 24 side, and the blown air from the turbo fan 16 is blown from the entire surface of the baffle plate 25 while reducing the pressure fluctuation of the blown air by the buffer effect. The influence on the piping temperature detection function and the like of the indoor heat exchanger 18 due to the outflow to the piping chamber 24 side can be suppressed. As a result, the NZ sound is reduced and the audibility of the indoor unit 2 is improved while eliminating the influence on the heat exchanger fixing function due to the deterioration of function and rigidity due to the provision of holes such as the slit holes 25A in the baffle plate 25. can do.

  Further, in the present embodiment, the baffle plate 25 provided in the opening 18A at one corner of the indoor heat exchanger 18 is bent and formed in a convex shape on the outer piping chamber 24 side. For this reason, the distance between the baffle plate 25 and the turbo fan 16 is made as large as possible by bending the baffle plate 25 into a convex shape toward the piping chamber 24, and the distance is kept substantially uniform. As a result, the above-mentioned distance is increased, and the pressure fluctuation between the baffle plate 25 and the turbo fan 16 is further reduced due to the attenuation effect by maintaining the distance substantially uniform, and the NZ sound is further increased. By reducing it, the audibility of the indoor unit 2 can be improved.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the baffle plate 25 is bent into the convex shape toward the piping chamber 24, so that the baffle plate 25 is bent in a U-shape. It is good also as the shape curved by.

  Moreover, although the hole drilled in the baffle plate 25 is a horizontally long slit hole 25A, it is not always necessary to use the slit hole 25A, and it is needless to say that it may be a circular hole, for example. When the slit hole 25 </ b> A is provided only in a region on the downstream side in the turbo fan rotation direction N of the upper half of the baffle plate 25, the slit hole 25 </ b> A may be provided in a range approximately half or less in the width direction of the baffle plate 25.

1 Air conditioner 2 Indoor unit (air conditioner)
3 Outdoor unit 10 Unit body 16 Turbo fan 16A Main plate 18 Indoor heat exchanger (heat exchanger)
18A Opening 23 Inner space 24 Piping chamber 25 Baffle plate 25A Slit hole (hole)
N Direction of turbo fan rotation

Claims (5)

A heat exchanger that is bent and formed in a rectangular shape so as to surround a turbo fan provided in the unit main body and that has one corner portion opened is disposed. In an air conditioner provided with a baffle plate that partitions between an inner space and an outer piping chamber partitioned by a heat exchanger,
The air conditioner, wherein the baffle plate is formed with a plurality of holes only in an upper half portion corresponding to a main plate side of the turbofan.   The air conditioner according to claim 1, wherein the plurality of holes formed in the baffle plate are slit holes that are elongated in the horizontal direction.   The plurality of holes formed in the baffle plate are provided only in a region on the downstream side in the turbo fan rotation direction of the upper half of the baffle plate. Air conditioner.   The air conditioner according to any one of claims 1 to 3, wherein the baffle plate is bent into a convex shape toward the outer piping chamber. A heat exchanger that is bent and formed in a rectangular shape so as to surround a turbo fan provided in the unit main body and that has one corner portion opened is disposed. In an air conditioner provided with a baffle plate that partitions between an inner space and an outer piping chamber partitioned by a heat exchanger,
The air conditioner is characterized in that the baffle plate is bent into a convex shape toward the outer piping chamber.

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